Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 18 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 548 1988 0 1988 1988 state | 548 43 0 43 43 county | 548 72 0 72 72 fatals | 548 1.067518 .278747 1 4 st_case | 548 430306.6 174.1708 430002 430600 -------------+--------------------------------------------------------- a_crainj | 548 1 0 1 1 a_region | 548 2 0 2 2 a_ru | 548 1.582117 .5118428 1 3 a_inter | 548 1.965328 .2276228 1 3 a_relrd | 548 1.822993 1.228717 1 4 -------------+--------------------------------------------------------- a_intsec | 548 1.892336 .3160769 1 3 a_roadfc | 548 4.330292 1.49173 1 7 a_junc | 548 1.905109 .3448914 1 4 a_mancol | 548 1.711679 1.209685 1 6 a_rd | 548 3 0 3 3 -------------+--------------------------------------------------------- a_tod | 548 1.629562 .4833632 1 2 a_dow | 548 1.547445 .4981986 1 2 a_hr | 548 1.90146 .2983159 1 2 a_ct | 548 1.354015 .5530721 1 3 a_lt | 548 1.994526 .0738542 1 2 -------------+--------------------------------------------------------- a_mc | 548 1.936131 .2447421 1 2 a_spcra | 548 1.492701 .5004035 1 2 a_ped | 548 1.635036 .4818598 1 2 a_pedal | 548 1.963504 .187693 1 2 a_roll | 548 1.883212 .3214613 1 2 -------------+--------------------------------------------------------- a_polpur | 548 2 0 2 2 a_posbac | 548 2.279197 .8971648 1 3 a_d15_19 | 548 1.890511 .3125371 1 2 a_d16_19 | 548 1.894161 .307913 1 2 a_d15_20 | 548 1.859489 .3478339 1 2 -------------+--------------------------------------------------------- a_d16_20 | 548 1.863139 .3440149 1 2 a_d65pls | 548 1.948905 .2203925 1 2 a_d21_24 | 548 1.815693 .3880883 1 2 a_d16_24 | 548 1.691606 .4622522 1 2 a_dist | 548 1.994526 .0738542 1 2 -------------+--------------------------------------------------------- a_drowsy | 548 1.998175 .0427179 1 2 by Jean Roth , jroth@nber.org , 18 Apr 2016